Documentation
How the numbers are arrived at.
Reference material for the engineers who have to defend a design. Each article gives the formula the engine actually runs, the standard it cites, and — the part that matters — where that calculation stops being valid.
How this differs from the rest of the site
- Features
- what a capability does, and what it produces
- Guides
- a task walked end to end
- Docs
- the mechanism, the formula, the standard, the limits
Every article names the source files behind its numbers, so they can be re-checked.
Getting started
What the model is, and the order the work happens in.
Calculations and standards
The formulas, thresholds and standards behind each computed number — and where each one stops.
- Power: PoE, UPS and thermal The PoE class ceilings, headroom rules, UPS runtime model and BTU/CFM conversions actually computed — and where each one becomes an estimate. IEEE 802.3af / at / bt · IEEE Std 485 · ASHRAE TC 9.9
- Cable and fiber planning How a run length is composed, the capstan physics deciding whether a pull is feasible, the distance limits, and what fiber planning does not do. ANSI/TIA-568 · TIA-569 · TIA-598 · BICSI TDMM
- Camera optics: DORI and occlusion The DORI pixel-density thresholds, the four projection models, how line of sight is decided, and the specific truth about glass and infrared. IEC 62676-4
- Wi-Fi RF propagation The hybrid path-loss selection, the ITU-R models in use, how wall materials and racking are charged, and what field calibration actually does. ITU-R P.1238 · ITU-R P.526 · ITU-R P.2040 · NIST IR 6055
Check the maths against your own job
Bring a floor plan and we will walk the calculations on it — including the places where the answer is an estimate and says so. Talk to us about what your team needs.